There are lots of big trees in Williamsburg, more than you would probably find in a similar area of a natural forest. People protect these trees. In my first picture, you can see the cable of a lightning rod that protects the large sycamore from lighting. My shadow in included to show reference.
There are also lots of very large catalpa trees around town. Catalpa is widely planted around the U.S. but is not native to Virginia, so strictly speaking this is not an authentic Williamsburg tree. But it grows very well. My other pictures show a live oak and some sycamores.